Enable user to patch elevated products
Computer Configuration\Administrative Templates\Windows Components\Windows Installer
Allows users to upgrade programs during privileged installations.
This policy permits all users to install patches, even when the installation program is running with elevated system privileges. Patches are updates or upgrades that replace only those program files that have changed. Because patches can easily be vehicles for malicious programs, some installations prohibit their use.
By default, only system administrators can apply patches during installations with elevated privileges, such as installations offered on the desktop or displayed in Add/Remove Programs.
This policy does not affect installations that run in the user's security context. By default, users can install patches to programs that run in their own security context.